Well a lot of game series can be summed up into "If you played one, you played them all.".
There usually are differences, but they're never groundbreaking. More like improving on what we already have.
GTA, CoD, Assassin's Creed, all sports series, the list goes on and it's pretty long.
This is not a bad thing. The fans will love it, because they get what they like + something extra, like new possibilities, new game modes etc.
This approach is much better than just making a completely new game and slap on it the name of some already existing series and act like it belongs there, while it's a vastly different game than the rest of the series.
Devil May Cry, Final Fantasy, Resident Evil and again the list goes on.
But that's just my opinion. For somebody else, the first option can seem worse.
Problem is that there's no way to make everyone happy, so there will always be those that don't like something about the game. Look at Duke Nukem Forever. They wanted to add so many things to the game to make it perfect and make everyone happy, that the game took like 12? years to develop and was mostly pretty horrible. It's only good quality was the nostalgia for those who grew up on good old Duke as kids.